Hi striker,
Unfortunately, the current posting issues you are experiencing are related to some current technical issues on eBay's side of things, which they have acknowledged on their System Announcements page located at:
http://www2.ebay.com/aw/announce.shtml
They have expressed that they are working urgently to address these technical difficulties, and will be posting further updates to that page as additional information becomes available.
We apologize for the difficulties.
-Mike